In order to study the machined surface topography and its reasons when cutting free-cutting steels with dif-ferent Te contents,the cutting experiments of three kinds of free-cutting steels 12L14,12L14+Te(0.017)and 12L14+Te(0.05)with different Te contents are carried out by using cemented carbide tools.The experimental results show that the machined surface topography of cutting 12L14+Te(0.017)is smoothest with lowest roughness value,the machined surface topography of cutting 12L14+Te(0.05)is roughest and the microscopic topography shows more tearing on it.The ma-chined surface topography of cutting 12L14 without Te element is between the two.With the addition of Te element,the ma-terial will generate compounds with low melting point such as MnTe,which play the role of stress concentration source in cutting process,and easily lead to micro-tearing on the machined surface,but at the same time it can also reduce the possi-bility of the formation of tool debris.Therefore,the formation of the machined surface morphology of the free cutting steel is the result of the comprehensive influence of the two factors.
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